
Constant fraction discriminator in pulsed time-of-flight laser rangefinding
Ruitong ZHENG, Guanhao WU
Front. Optoelectron. ›› 2012, Vol. 5 ›› Issue (2) : 182-186.
Constant fraction discriminator in pulsed time-of-flight laser rangefinding
Constant fraction discriminator (CFD) is one of theoretic method which can locate timing point at same fraction of echo pulse in pulsed time-of-flight (TOF) laser rangefinding. In this paper, the theory of CFD method was analyzed in reality condition. The design, simulation and printed-circuit-board (PCB) performance of CFD circuit were shown. Finally, an over amplified method was introduced, by which the influence of direct-current (DC) bias error could be reduced. The experimental results showed that timing discriminator could set the timing point to a certain point on echo pulse, which did not depend on the amplitude of echo pulse.
constant fraction discriminator (CFD) / time-of-flight (TOF) / pulsed TOF laser rangending / direct-current (DC) bias error
Fig.4 Experimental result of CFD circuit. Yellow (CH1) curve is the waveform of the output of pulse delay circuit. Pink (CH3) curve is the waveform of the attenuated pulse. In sub-figures (a), (b), (c) and (d), the amplitude of pulse is 0.6, 0.8, 1.0 and 1.2 V respectively. The trigger source of the oscilloscope is set to CH1 which is the delayed signal. The trigger voltage is automatically set to 224 mV for all of the four conditions. This setup ensures the time reference keeps unchanged during the input signal increases from 0.6 to 1.2 V |
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